performance tuning books

user data on each disk, Causing greater I/O rates to the physical disk and allowing disk bottlenecks to occur. The most common disk bottleneck is that the hard disk is too small; Most disk configurations are based on capacity requirements rather than performance; The cheapest solution may be a small number of large-capacity disks; The second most common problem is having too handle logical disks on the same array. This increases seek time and signif

Article Title: Linux performance monitoring and tuning (CPU ). Linux is a technology channel of the IT lab in China. Includes basic categories such as desktop applications, Linux system management, kernel research, embedded systems, and open source. In fact, there are many articles on this part on the Internet. Why is this article still available? There are several reasons why it is the motivation of my tra

Hardware preparation environment: Hard Disk: 16 SAS15KRAID5 with 512 MCacheCPU: AMD4 core two memory: 16 GB software environment: Operating System: RedHatAS4.62.6.9 Hardware preparation environment: Hard Disk: 16 SAS 15 K RAID5 with 512 MCacheCPU: AMD 4-core two-core memory: 16 GB software environment: Operating System: RedHat AS4.6 2.6.9 Hardware preparation environment: Hard drive: 16 SAS 15 k raid 5 with 512 MCache CPU: AMD 4-core two Memory: 16 GB Software environment: Operating System:

conditions, filtering conditions, aggregate queries, and sorting fields as index candidate fields. C. Combine frequently-used fields to form a composite index. The field order of the composite index is the same as that of the primary key. You also need to put the most commonly used fields in front, put the fields with low repetition rate in front. D. Do not add too many indexes to a table because the index affects the insert and update speeds. Indexing is not only a matter of consideration when

Hardware preparation environment: Hard drive: 16 SAS 15 k raid 5 with 512 MCache CPU: AMD 4-core two Memory: 16 GB Software environment: Operating System: RedHat AS4.6 2.6.9-67. ELsmp Mysql: 5.0. Performance Tuning based on different scenarios is as follows: Scenario: Write operations (insert, query, and delete) are intensive, and the data capacity far exceeds the memory size (minimum is more than GB, or ev

Article Source: http://hi.baidu.com/top2top/blog/item/0bea951600a16050f2de322b.html apache2.0 prefork and worker module Performance Tuning The performance improvement of Apache 2.0 is the most attractive. On UNIX systems that support POSIX Threads, Apache can use different MPM to run in a mix of multi-process and multi-thread modes to enhance the scalabi

From January Google released 16 series of video on performance optimization, this period of time in the major communities have seen a lot of excellent articles about the optimization series. We have analyzed the causes of performance, shared how to optimize our applications, and introduced tools to help us detect performance issues.One of the tools that is descri

PrefaceA project in the development, testing, on-line, then the size of the user is still relatively small, so just on-line projects are generally stable performance. However, with the passage of time, the increase in the number of users, the increase in QPS and other factors will cause the project slowly show a half-day unresponsive situation. In the previous work also happened to encounter this process, at that time, the project carried out a lot of

, you can copy the collection into an array.Pay attention to redraw and re-typesetting, batch modify style, operate DOM tree offline, cache and reduce access to layout information.Use absolute coordinates in animations, using drag-and-drop proxies.Minimize the number of event handles using event-managed technology.Algorithm and process optimizationThe performance characteristics of the for,while,do-while cycle are similar, and no one is faster or slow

default.Copying files between OSS, currently only supports copying object and does not support copying multipart.General recommendationsJobs * Parallel and CPU cores are 1:1,2:1, but not too bigToo many concurrent numbers will directly fill the network card, the CPU will be crowded. It is recommended to observe the environment CPU, network, process/thread condition while concurrencyReferenceOssutil Large File Breakpoint continuationPlease add a link to the original link descriptionThis article

operations, SQL operations, list refreshes, etc.) consume resources using the background process to implement, can not occupy the UI thread, the UI thread is the main thread, the main thread is the key to keep the program smooth, should only operate those core UI operations, such as processing view properties and drawing; Minimize the wake-up mechanism. We often use broadcasts to receive messages and events that are expected to respond, but too much of the response exceeds our own requireme

1. JPS (Java Virtual machine Process Status Tool)JPS is primarily used to output process state information running in the JVM-Q does not output the class name, jar name, and parameters passed in the Main method-m output parameters that pass in the Main method-L OUTPUT The full name of the main class or Jar-V Output parameters for incoming JVM2. JstackJstack is used primarily to view thread stack information within a Java processThe command line parameter options are described below:-L long listi

Performance optimizations for CSS: Related tuning of Style tags How to use special CSS styles CSS abbreviation (color, up or down merge, etc.) CSS declarations (the class on the page should be unique globally, and locating a node with a unique class name is often quicker than combining positioning.) separation of styles from elements, both independently maintained ) CSS selectors (the ID select

AIX Performance Tuning-Memory and CPU Sar-P all CPU usage Sar-A File AccessThe number of fast reads (B) by the Directory Access daemon when the dirblk/s locates the fileIget/s I node to find the number of times the system process is calledLookuppn/s Directory: the number of times the process finds the V node and obtains the path name. Activity of SAR-B buffer, including transmission, access, and hit rateNu

for new TCP connections, which defaults to 0, which means shutdown; Net.ipv4.tcp_tw_recycle = 1 indicates a fast recovery of time-wait sockets in a TCP connection, and the default is 0, which means close; NET.IPV4.TCP_FIN_TIMEOUT=30 modifies the default timeout time for the system . If the above configuration tuning performance is not ideal, you can continue to modify the configuration:Vi/etc/sysctl.co

Linux system Performance Tuning related commands summary:1. PS: See which processes are currently running in the systemCommon commands are PS aux | Grep-i MySQLHttp://www.cnblogs.com/peida/archive/2012/12/19/2824418.html2. Top: Dynamic display of the CPU, memory usage, and load of each programHttp://www.cnblogs.com/ggjucheng/archive/2012/01/08/2316399.html3. Overall load of IO, process IO load, load from a

MySQL Management: Performance tuning, high availability and monitoring mini-bookmysql5.5.x Main Improvements1. Use InnoDB storage engine by default2. Make full use of CPU multi-core processing capability3, improve the number of brush write dirty pages and merge the number of inserts, improve I/O4, let Innodb_buffer_pool buffer pool of heat data to survive longer, pollution problems5, InnoDB Data recovery ti

so that you can mark the snapshot information set at important times. A baseline is defined between a pair of snapshots, and the snapshot is identified by their snapshot sequence number. eachThe baseline has only a couple of snapshots. A typical performance tuning practice starts with collecting baseline collections of metrics, making changes, and then capturing another set of baselines. You can compare th

UWP control development-SizeChanged performance tuning, uwpsizechangedIntroduction In the previous article "UWP control development -- packaging your own controls with NuGet", we mentioned some issues in the layout system and time-use of XAML (rewrite Measure/Arrange or use SizeChanged ?), This blog post briefly describes the behavior of the XAML Layout System and summarizes several rules. Of course, the re

operations, although PHP file operation efficiency is not low;41, optimize the Select SQL statement, as far as possible, as little as possible to insert, update operation (on the update, I was a bad batch);42, as far as possible the use of PHP internal functions (but I have to find a php non-existent function, wasted can write a custom function of time, experience problem ah!);PS: Built-in functions are nearly an order of magnitude more efficient than user-defined functions.43, the loop inside